Refers to the lively energy or spirit that makes someone or something feel alive and vibrant. Often used when describing a person's expression, a place's atmosphere, or the quality of a performance.
His face was full of vitality.
This painting is brimming with life.
生気 refers to the vital energy or life force something possesses, while 躍動 emphasizes the visible, pulsating motion that expresses that energy.
生気 refers to the life force or vital spark within a person or living thing, whereas 活気 describes the lively atmosphere of a place or group.
Compound of 生 (life, living) and 気 (spirit, energy). The combination straightforwardly conveys the idea of life energy or vitality.